New numismatic book

Literally minutes ago the mail lady delivered my latest addition to the numismatic library. Dalton& Hamers " The Provincial Token Coinage of the 18th Century"(okay, maybe I'm in the wrong section here.) I had to open the box myself.
I paid $185 plus shipping for this volume, the most I have laid out for a numismatic reference work(although I have paid more for antique ceramic reference works.) What is the costliest piece in your reference library?

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Comments
Early Half Dollar Varieties 1794-1836, Third Edition by Al Overton
Cost me 90 bucks, but I think worth every penny.
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bob
<< <i>Dalton& Hamers " The Provincial Token Coinage of the 18th Century" >>
Want it.
<< <i>Early Half Dollar Varieties 1794-1836, Third Edition by Al Overton >>
Sold it.
<< <i>Breen's encyclopedia of US coins, about $200 in hard cover with dust jacket. >>
Have it.
The Breen/Swaitek Commemorative book cost me about $125 at the time. The new edition is listed on Amazon pre-order at $150. I'm debating whether to get it.
JH
Proof Buffalo Registry Set
Capped Bust Quarters Registry Set
Proof Walking Liberty Halves Registry Set
My costliest sets are the first 20 bound volumes of AJN and the 13 volume set of the original Coin Collector's Journal.
Costliest single books are an original Crosby and a thick-paper Phillips.
I can't write the numbers without crying. The two sets each were more than my first 3 cars combined.
<< <i>Me thinks the most expensive book may likely be the one that is not purchased. >>
POTD
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-- Holden Center, professional numismatist, author of 100 Coins I Have Loved
<< <i>Me thinks the most expensive book may likely be the one that is not purchased. >>
Good point!!!